Pre-galvanized cable trunking is fabricated from sheet steel that has already received a zinc coating before cutting, punching, and press-brake forming. It is commonly used to contain, protect, and organize cable routes in factories, buildings, warehouses, and technical areas with relatively dry indoor conditions.
Compared with finishes applied after fabrication, pre-galvanized steel simplifies the manufacturing process and offers reasonable cost. Actual corrosion resistance, however, depends on the sheet grade, coating mass, cut edges, fabricated holes, and installation environment. The product should therefore be selected for the correct service conditions rather than treated as a universal solution.
The Sun manufactures pre-galvanized cable trunking to project dimensions, thicknesses, construction details, and drawings, complete with matching covers, joints, and directional fittings.
1. What Is Pre-Galvanized Cable Trunking?
Pre-galvanized sheet is zinc-coated on a production line before it reaches the fabrication workshop. The Sun cuts, punches, and forms this material into trunking bodies, covers, and fittings.
The trunking is normally box-shaped and may use a cover to limit dust ingress or mechanical impact from above. A complete system includes straight bodies, covers, joints, horizontal elbows, risers, droppers, tees, crosses, reducers, and support components to the design.
Understanding the zinc coating correctly
The zinc layer is present on the steel surface before fabrication. Cutting or punching changes the coating condition at cut edges and mechanically affected areas compared with the original sheet surface. This is an important difference from hot-dip galvanizing, where fully formed components are coated after fabrication.
2. Why Do Many Projects Choose Pre-Galvanized Steel?
Reasonable cost
The material already has a surface coating, so no additional painting or hot-dip galvanizing is required after forming. This helps optimize costs for projects with a suitable installation environment.
Efficient fabrication schedule
Sheet blanks can be cut, punched, and formed directly to specification. Actual lead time still depends on material availability, quantity, fitting complexity, and the production schedule at the time of order.
Uniform metallic surface
Pre-galvanized sheet has a characteristic metallic appearance suitable for many indoor technical areas. No paint color selection is required, and the product coordinates easily with metal support systems.
Easy fabrication to drawings
The Sun can adjust width, height, thickness, hole positions, and fittings to the actual cable route. Finalizing drawings before production helps straight sections and fittings assemble more consistently on site.
3. Which Projects Is Pre-Galvanized Cable Trunking Suitable For?
- Covered factories: production areas and warehouses with controlled humidity.
- Buildings and shopping centers: ceiling voids, service floors, electrical rooms, and back-of-house areas.
- Offices: electrical, control, and communication cable routes in technical spaces.
- Warehouses and residential projects: locations requiring neat cable organization, inspection, and expansion.
- Cost-optimized projects: where the environment does not require a higher-performance corrosion-protection system.
The product should not automatically be specified for long-term outdoor exposure, areas with standing water, coastal locations, or chemical contact. In these cases, hot-dip galvanized cable trunking, stainless steel, ZAM, or another coating system suited to the environmental corrosion category should be evaluated.
4. Cable Trunking Construction and Fittings
- Trunking body: contains and protects the cable route.
- Cover: closes the top where required by the design.
- Joint: connects straight sections into a continuous route.
- Directional fittings: horizontal and vertical elbows, tees, crosses, and reducers.
- Support fittings: brackets, strut channels, threaded rods, and connecting components.
Fittings should be ordered with straight sections to minimize dimensional differences and site modifications. Where drawings contain many branches or level changes, fitting orientation and joint positions should be clearly defined.
5. Reference Technical Specifications
| Parameter | Reference specification |
|---|---|
| Product name | Pre-galvanized cable trunking |
| Product type | Enclosed trunking, optional cover |
| Substrate | Pre-galvanized sheet steel |
| Surface | Zinc coating pre-applied to the steel sheet |
| Length | To manufacturing specification and project requirements |
| Width W | To cable quantity, size, and arrangement |
| Height H | To cable-route design |
| Thickness T | To dimensions, load, and support spacing |
| Cover | With or without, depending on design |
| Fittings | Elbows, tees, crosses, reducers, joints, and support fittings |
| Fabrication | To specification or drawing |
Common dimensions
Sizes of 100 × 50, 200 × 50, 100 × 100, 200 × 100, 300 × 100, and 400 × 100 mm are frequently used. The Sun also fabricates to drawings. Final dimensions should account for cable quantity and diameter, bending radius, fill ratio, future capacity, and available support space.
6. How to Select Cable Trunking Thickness
Thickness should not be selected solely by trunking width or the lowest unit price. For the same dimensions, structural requirements can differ with cable load and support arrangement.
- Trunking width and height.
- Total cable weight per meter of route.
- Spacing between supports.
- Support type and horizontal or vertical installation.
- Additional loads during construction.
- Allowance for future cable additions.
- Transport and installation conditions.
For large cable routes or long support spans, material thickness and support spacing must be assessed together. Thickness should not be increased by habit while ignoring the support-system design.
7. What Does the Zinc Coating Do?
The zinc layer creates a barrier between the steel substrate and the environment. Under suitable conditions, zinc can also provide electrochemical protection to steel at minor coating damage. Protection depends on coating mass, exposure to moisture, chlorides, chemicals, and service duration.
Pre-galvanized steel should not be described as “rust-free” or suitable for every environment. Cut edges, punched holes, and fabricated areas require closer consideration because their protection can differ from the original sheet surface.
8. Cut-Edge and Fabricated-Hole Considerations
When pre-galvanized sheet is cut or punched, the steel substrate may be exposed at the edge. The effect depends on material thickness, coating mass, the size of the exposed area, and the environment. In dry indoor spaces, the product generally performs well when manufactured and stored correctly.
- Avoid unnecessary additional cutting or drilling on site.
- Remove burrs and sharp edges before installing cables.
- Consider additional protection for new site-fabricated areas.
- Do not allow water or chemicals to collect at edges and joints.
9. Manufacturing Process at The Sun
Material inspection → Blank cutting → Punching/cutting to specification → Press-brake forming → Fitting fabrication → Inspection → Cleaning → Packing.
Because the coating is already present on the blank, the process must minimize surface scratches during cutting, forming, transportation, and stacking. Components are checked for dimensions and fit-up before packing.
10. Cable Trunking Quality Inspection
- Dimensions: width, height, length, thickness, and hole positions.
- Shape: straightness, squareness, distortion, and cover fit.
- Assembly: compatibility between straight sections, joints, and fittings.
- Surface: scratches, burrs, unusual indications, and cut-edge condition.
- Packing: protection during storage and transportation.
11. Transport, Storage, and Installation
- Store products in a dry, ventilated place and prevent water from collecting between layers.
- Do not drag trunking over hard surfaces or allow impact that causes distortion.
- Use the designed support spacing and verify stability before installing cables.
- Remove sharp edges and burrs where they could contact cables.
- Provide equipotential bonding, grounding, and electrical measures to the project design.
12. Comparison with Other Cable Trunking Finishes
| Trunking type | Main characteristics | Typical suitable environment |
|---|---|---|
| Pre-galvanized steel | Pre-coated blank, easy fabrication, reasonable cost | Indoors and relatively dry areas |
| Powder-coated steel | Multiple colors and a uniform finished surface | Indoors where color or appearance is required |
| Hot-dip galvanized steel | Galvanized after fabrication with good corrosion resistance | Outdoor or damp areas; environment must be assessed |
| Stainless steel 304/316 | High corrosion resistance and easy cleaning | Food, chemical, and high-demand environments |
| ZAM | Alloy coating with good corrosion resistance | Depending on material grade and project conditions |
No material is best for every project. Final selection should consider environment, load, required service life, appearance, schedule, and total budget.
See the overview pages for Cable Trunking, Powder-Coated Cable Trunking, and Hot-Dip Galvanized Cable Trunking.
13. Pre-Galvanized Cable Trunking Pricing
Product prices depend on W × H dimensions, thickness, length, material type, quantity, construction, covers, fittings, and delivery location. Steel prices and material availability at the time of order may also affect the quotation.
For an accurate quotation, customers should provide: dimensions + thickness + length + quantity + fittings + drawings (if available).
14. The Sun Fabricates to Project Drawings
The Sun manufactures trunking bodies, covers, joints, and fittings to specifications or drawings. Customers can specify dimensions, thickness, construction, hole positions, and a fitting arrangement suitable for the cable route. Defining all requirements before production minimizes site modifications.
Reference Price List for Pre-Galvanized Cable Trunking
Reference unit prices per meter, excluding VAT. The table below shows prices for uncovered trunking bodies and complete sets with covers. These are reference prices at The Sun’s factory and may change with material prices, quantities, drawings, material requirements, and surface finish at the time of order. Please contact us to confirm the quotation, shipping cost, and lead time.
| Specification (Width × Height × Thickness) | Price without cover (VND/m) | Price with cover (VND/m) |
|---|---|---|
| 60x40x0.8 | 31,000 | 47,000 |
| 60x40x1.0 | 37,000 | 57,000 |
| 60x40x1.2 | 43,000 | 66,000 |
| 60x40x1.5 | 53,000 | 81,000 |
| 50x50x0.8 | 33,000 | 47,000 |
| 50x50x1.0 | 40,000 | 57,000 |
| 50x50x1.2 | 46,000 | 66,000 |
| 50x50x1.5 | 56,000 | 81,000 |
| 100x50x0.8 | 43,000 | 67,000 |
| 100x50x1.0 | 51,000 | 79,000 |
| 100x50x1.2 | 60,000 | 93,000 |
| 100x50x1.5 | 72,000 | 112,000 |
| 100x50x2.0 | 93,000 | 145,000 |
| 200x50x0.8 | 62,000 | 104,000 |
| 200x50x1.0 | 74,000 | 125,000 |
| 200x50x1.2 | 86,000 | 145,000 |
| 200x50x1.5 | 105,000 | 177,000 |
| 200x50x2.0 | 135,000 | 229,000 |
| 100x100x0.8 | 62,000 | 86,000 |
| 100x100x1.0 | 74,000 | 102,000 |
| 100x100x1.2 | 86,000 | 119,000 |
| 100x100x1.5 | 105,000 | 145,000 |
| 100x100x2.0 | 135,000 | 187,000 |
| 200x100x1.0 | 97,000 | 148,000 |
| 200x100x1.2 | 113,000 | 172,000 |
| 200x100x1.5 | 137,000 | 209,000 |
| 200x100x2.0 | 177,000 | 271,000 |
| 300x100x1.0 | 120,000 | 193,000 |
| 300x100x1.2 | 140,000 | 226,000 |
| 300x100x1.5 | 169,000 | 273,000 |
| 300x100x2.0 | 219,000 | 354,000 |
| 400x100x1.2 | 167,000 | 279,000 |
| 400x100x1.5 | 202,000 | 338,000 |
| 400x100x2.0 | 261,000 | 437,000 |
Note: the table lists common specifications only. The Sun also manufactures other dimensions and thicknesses to technical documentation.
15. Frequently Asked Questions
Can pre-galvanized cable trunking be used outdoors?
It should not automatically be specified for long-term outdoor use. If the route is regularly exposed to rain, condensation, or a corrosive environment, hot-dip galvanizing or another material should be evaluated.
How does pre-galvanized steel differ from hot-dip galvanizing?
Pre-galvanized steel is coated before fabrication. Hot-dip galvanized cable trunking is fully formed before immersion, so the production sequence and protection at cut edges, holes, and welds differ.
What cable trunking sizes are available?
The Sun manufactures many sizes to order. Specifications should be selected according to cable quantity, load, installation space, and future expansion.
Is a trunking cover required?
It depends on the location and cable-protection requirements. A cover limits dust and impact from above but should also allow convenient cable inspection, addition, and replacement.
What information is required when ordering?
Provide the dimensions, thickness, length, quantity, cover type, fitting list, installation location, and drawings if available.
16. Order Pre-Galvanized Cable Trunking
Send the cable-route information or drawings so The Sun can check the specifications, fittings, materials, and provide a project quotation.
THE SUN JOINT STOCK COMPANY
Website: thesun.vn
Hotline/Zalo: 0903 988 018
Email: info@thesun.vn
Products: cable trunking, cable trays, cable ladders, wire-mesh trays, and fittings.